From cc03ff9d0a147a399a11c9f513afa5e06ceee453 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Thu, 6 Feb 2014 12:06:55 +0100 Subject: [PATCH] xhci iso: allow for some latency Allow the scheduled transfer time be a bit behind, to compensate for latencies. Without this xhci will wait way to often for the mfindex wraparound, assuming the scheduled time is in the future just because qemu is a bit behind in processing the iso transfer requests. Signed-off-by: Gerd Hoffmann --- hw/usb/hcd-xhci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index 706cdc732a..8261d00296 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -1977,7 +1977,7 @@ static void xhci_calc_iso_kick(XHCIState *xhci, XHCITransfer *xfer, xfer->mfindex_kick = ((xfer->trbs[0].control >> TRB_TR_FRAMEID_SHIFT) & TRB_TR_FRAMEID_MASK) << 3; xfer->mfindex_kick |= mfindex & ~0x3fff; - if (xfer->mfindex_kick < mfindex) { + if (xfer->mfindex_kick + 0x100 < mfindex) { xfer->mfindex_kick += 0x4000; } }